After the mouth ulcers of pregnant women, do not use the conventional treatment of mouth ulcers, especially iodine-containing mouthwash or iodine-containing preparations, and not to paste metronidazole patch. These are prohibited and cautious drugs for pregnant women, especially metronidazole, which can easily cause teratogenic and carcinogenic effects. This period can be more with light salt water for gargling, light salt water on the body of pregnant women and fetus without any harm, but also can play the role of sterilization, anti-inflammatory. Ulcers have a certain degree of self-healing, and usually heal in about a week, even without any manipulation. Pregnant women who have mouth ulcers due to lack of micronutrients in their body can consume more fruits and vegetables, and should never be picky about what they eat.